Cpanel does not enter my network

Guys, I have a problem and "Bizarro".
In my client's network can not access cPanel or webmail.
- IP is not blocked
- Already cleaned my nameservers windows
- I cleared cookies browser
- Normally access another Quaker NETWORK.
- Have tried unplugging and reconnecting Proxi
- It does not work neither with domain: 2082
- Does not work with cpanel.dominio
Anyway has anyone had this problem?